Add @include resolution in CLI render/export flows

[alpha912]

Problem

Parser supports @include resolution, but CLI commands do not expose it. Render/export flows parse without resolveIncludes, leaving includes unresolved in output.

Evidence

• omniscript-core/parser/src/parser.ts supports resolveIncludes/basePath.
• CLI commands call parse(text) without options in parse/render/export/format.

Expected

• Add CLI flags (e.g., --resolve-includes, --base-path, --max-depth).
• Use parse options in render/export/format to resolve includes when requested.
• Document new flags in CLI README.

Acceptance Criteria

• CLI can resolve @include directives safely (path traversal protection preserved).
• Tests cover include resolution and error cases.
• Documentation updated.